server/token.c

   1 /*
   2  * Tokens
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  * Copyright (C) 2003 Mike McCormack
   6  * Copyright (C) 2005 Robert Shearman
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <assert.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34
  35 #include "handle.h"
  36 #include "thread.h"
  37 #include "process.h"
  38 #include "request.h"
  39 #include "security.h"
  40
  41 #include "wine/unicode.h"
  42
  43 #define MAX_SUBAUTH_COUNT 1
  44
  45 const LUID SeIncreaseQuotaPrivilege        = {  5, 0 };
  46 const LUID SeSecurityPrivilege             = {  8, 0 };
  47 const LUID SeTakeOwnershipPrivilege        = {  9, 0 };
  48 const LUID SeLoadDriverPrivilege           = { 10, 0 };
  49 const LUID SeSystemProfilePrivilege        = { 11, 0 };
  50 const LUID SeSystemtimePrivilege           = { 12, 0 };
  51 const LUID SeProfileSingleProcessPrivilege = { 13, 0 };
  52 const LUID SeIncreaseBasePriorityPrivilege = { 14, 0 };
  53 const LUID SeCreatePagefilePrivilege       = { 15, 0 };
  54 const LUID SeBackupPrivilege               = { 17, 0 };
  55 const LUID SeRestorePrivilege              = { 18, 0 };
  56 const LUID SeShutdownPrivilege             = { 19, 0 };
  57 const LUID SeDebugPrivilege                = { 20, 0 };
  58 const LUID SeSystemEnvironmentPrivilege    = { 22, 0 };
  59 const LUID SeChangeNotifyPrivilege         = { 23, 0 };
  60 const LUID SeRemoteShutdownPrivilege       = { 24, 0 };
  61 const LUID SeUndockPrivilege               = { 25, 0 };
  62 const LUID SeManageVolumePrivilege         = { 28, 0 };
  63 const LUID SeImpersonatePrivilege          = { 29, 0 };
  64 const LUID SeCreateGlobalPrivilege         = { 30, 0 };
  65
  66 static const SID world_sid = { SID_REVISION, 1, { SECURITY_WORLD_SID_AUTHORITY }, { SECURITY_WORLD_RID } };
  67 static const SID local_sid = { SID_REVISION, 1, { SECURITY_LOCAL_SID_AUTHORITY }, { SECURITY_LOCAL_RID } };
  68 static const SID interactive_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_INTERACTIVE_RID } };
  69 static const SID authenticated_user_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_AUTHENTICATED_USER_RID } };
  70 static const SID local_system_sid = { SID_REVISION, 1, { SECURITY_NT_AUTHORITY }, { SECURITY_LOCAL_SYSTEM_RID } };
  71 static const PSID security_world_sid = (PSID)&world_sid;
  72 static const PSID security_local_sid = (PSID)&local_sid;
  73 const PSID security_interactive_sid = (PSID)&interactive_sid;
  74 static const PSID security_authenticated_user_sid = (PSID)&authenticated_user_sid;
  75 static const PSID security_local_system_sid = (PSID)&local_system_sid;
  76
  77 static luid_t prev_luid_value = { 1000, 0 };
  78
  79 struct token
  80 {
  81     struct object  obj;             /* object header */
  82     luid_t         token_id;        /* system-unique id of token */
  83     luid_t         modified_id;     /* new id allocated every time token is modified */
  84     struct list    privileges;      /* privileges available to the token */
  85     struct list    groups;          /* groups that the user of this token belongs to (sid_and_attributes) */
  86     SID           *user;            /* SID of user this token represents */
  87     SID           *primary_group;   /* SID of user's primary group */
  88     unsigned       primary;         /* is this a primary or impersonation token? */
  89     ACL           *default_dacl;    /* the default DACL to assign to objects created by this user */
  90     TOKEN_SOURCE   source;          /* source of the token */
  91     SECURITY_IMPERSONATION_LEVEL impersonation_level; /* impersonation level this token is capable of if non-primary token */
  92 };
  93
  94 struct privilege
  95 {
  96     struct list entry;
  97     LUID        luid;
  98     unsigned    enabled  : 1; /* is the privilege currently enabled? */
  99     unsigned    def      : 1; /* is the privilege enabled by default? */
 100 };
 101
 102 struct group
 103 {
 104     struct list entry;
 105     unsigned    enabled  : 1; /* is the sid currently enabled? */
 106     unsigned    def      : 1; /* is the sid enabled by default? */
 107     unsigned    logon    : 1; /* is this a logon sid? */
 108     unsigned    mandatory: 1; /* is this sid always enabled? */
 109     unsigned    owner    : 1; /* can this sid be an owner of an object? */
 110     unsigned    resource : 1; /* is this a domain-local group? */
 111     unsigned    deny_only: 1; /* is this a sid that should be use for denying only? */
 112     SID         sid;
 113 };
 114
 115 static void token_dump( struct object *obj, int verbose );
 116 static unsigned int token_map_access( struct object *obj, unsigned int access );
 117 static void token_destroy( struct object *obj );
 118
 119 static const struct object_ops token_ops =
 120 {
 121     sizeof(struct token),      /* size */
 122     token_dump,                /* dump */
 123     no_add_queue,              /* add_queue */
 124     NULL,                      /* remove_queue */
 125     NULL,                      /* signaled */
 126     NULL,                      /* satisfied */
 127     no_signal,                 /* signal */
 128     no_get_fd,                 /* get_fd */
 129     token_map_access,          /* map_access */
 130     no_lookup_name,            /* lookup_name */
 131     no_open_file,              /* open_file */
 132     no_close_handle,           /* close_handle */
 133     token_destroy              /* destroy */
 134 };
 135
 136
 137 static void token_dump( struct object *obj, int verbose )
 138 {
 139     fprintf( stderr, "Security token\n" );
 140     /* FIXME: dump token members */
 141 }
 142
 143 static unsigned int token_map_access( struct object *obj, unsigned int access )
 144 {
 145     if (access & GENERIC_READ)    access |= TOKEN_READ;
 146     if (access & GENERIC_WRITE)   access |= TOKEN_WRITE;
 147     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE;
 148     if (access & GENERIC_ALL)     access |= TOKEN_ALL_ACCESS;
 149     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 150 }
 151
 152 static SID *security_sid_alloc( const SID_IDENTIFIER_AUTHORITY *idauthority, int subauthcount, const unsigned int subauth[] )
 153 {
 154     int i;
 155     SID *sid = mem_alloc( FIELD_OFFSET(SID, SubAuthority[subauthcount]) );
 156     if (!sid) return NULL;
 157     sid->Revision = SID_REVISION;
 158     sid->SubAuthorityCount = subauthcount;
 159     sid->IdentifierAuthority = *idauthority;
 160     for (i = 0; i < subauthcount; i++)
 161         sid->SubAuthority[i] = subauth[i];
 162     return sid;
 163 }
 164
 165 static inline int security_equal_sid( const SID *sid1, const SID *sid2 )
 166 {
 167     return ((sid1->SubAuthorityCount == sid2->SubAuthorityCount) &&
 168         !memcmp( sid1, sid2, FIELD_OFFSET(SID, SubAuthority[sid1->SubAuthorityCount]) ));
 169 }
 170
 171 void security_set_thread_token( struct thread *thread, obj_handle_t handle )
 172 {
 173     if (!handle)
 174     {
 175         if (thread->token)
 176             release_object( thread->token );
 177         thread->token = NULL;
 178     }
 179     else
 180     {
 181         struct token *token = (struct token *)get_handle_obj( current->process,
 182                                                               handle,
 183                                                               TOKEN_IMPERSONATE,
 184                                                               &token_ops );
 185         if (token)
 186         {
 187             if (thread->token)
 188                 release_object( thread->token );
 189             thread->token = token;
 190         }
 191     }
 192 }
 193
 194 static const ACE_HEADER *ace_next( const ACE_HEADER *ace )
 195 {
 196     return (const ACE_HEADER *)((const char *)ace + ace->AceSize);
 197 }
 198
 199 static int acl_is_valid( const ACL *acl, data_size_t size )
 200 {
 201     ULONG i;
 202     const ACE_HEADER *ace;
 203
 204     if (size < sizeof(ACL))
 205         return FALSE;
 206
 207     size = min(size, MAX_ACL_LEN);
 208
 209     size -= sizeof(ACL);
 210
 211     ace = (const ACE_HEADER *)(acl + 1);
 212     for (i = 0; i < acl->AceCount; i++)
 213     {
 214         const SID *sid;
 215         data_size_t sid_size;
 216
 217         if (size < sizeof(ACE_HEADER))
 218             return FALSE;
 219         if (size < ace->AceSize)
 220             return FALSE;
 221         size -= ace->AceSize;
 222         switch (ace->AceType)
 223         {
 224         case ACCESS_DENIED_ACE_TYPE:
 225             sid = (const SID *)&((const ACCESS_DENIED_ACE *)ace)->SidStart;
 226             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart);
 227             break;
 228         case ACCESS_ALLOWED_ACE_TYPE:
 229             sid = (const SID *)&((const ACCESS_ALLOWED_ACE *)ace)->SidStart;
 230             sid_size = ace->AceSize - FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart);
 231             break;
 232         case SYSTEM_AUDIT_ACE_TYPE:
 233             sid = (const SID *)&((const SYSTEM_AUDIT_ACE *)ace)->SidStart;
 234             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_AUDIT_ACE, SidStart);
 235             break;
 236         case SYSTEM_ALARM_ACE_TYPE:
 237             sid = (const SID *)&((const SYSTEM_ALARM_ACE *)ace)->SidStart;
 238             sid_size = ace->AceSize - FIELD_OFFSET(SYSTEM_ALARM_ACE, SidStart);
 239             break;
 240         default:
 241             return FALSE;
 242         }
 243         if (sid_size < FIELD_OFFSET(SID, SubAuthority[0]) ||
 244             sid_size < FIELD_OFFSET(SID, SubAuthority[sid->SubAuthorityCount]))
 245             return FALSE;
 246         ace = ace_next( ace );
 247     }
 248     return TRUE;
 249 }
 250
 251 /* gets the discretionary access control list from a security descriptor */
 252 static inline const ACL *sd_get_dacl( const struct security_descriptor *sd, int *present )
 253 {
 254     *present = (sd->control & SE_DACL_PRESENT ? TRUE : FALSE);
 255
 256     if (sd->dacl_len)
 257         return (const ACL *)((const char *)(sd + 1) +
 258             sd->owner_len + sd->group_len + sd->sacl_len);
 259     else
 260         return NULL;
 261 }
 262
 263 /* gets the system access control list from a security descriptor */
 264 static inline const ACL *sd_get_sacl( const struct security_descriptor *sd, int *present )
 265 {
 266     *present = (sd->control & SE_SACL_PRESENT ? TRUE : FALSE);
 267
 268     if (sd->sacl_len)
 269         return (const ACL *)((const char *)(sd + 1) +
 270             sd->owner_len + sd->group_len);
 271     else
 272         return NULL;
 273 }
 274
 275 /* gets the owner from a security descriptor */
 276 static inline const SID *sd_get_owner( const struct security_descriptor *sd )
 277 {
 278     if (sd->owner_len)
 279         return (const SID *)(sd + 1);
 280     else
 281         return NULL;
 282 }
 283
 284 /* gets the primary group from a security descriptor */
 285 static inline const SID *sd_get_group( const struct security_descriptor *sd )
 286 {
 287     if (sd->group_len)
 288         return (const SID *)((const char *)(sd + 1) + sd->owner_len);
 289     else
 290         return NULL;
 291 }
 292
 293 /* checks whether all members of a security descriptor fit inside the size
 294  * of memory specified */
 295 static int sd_is_valid( const struct security_descriptor *sd, data_size_t size )
 296 {
 297     size_t offset = sizeof(struct security_descriptor);
 298     const SID *group;
 299     const SID *owner;
 300     const ACL *sacl;
 301     const ACL *dacl;
 302     int dummy;
 303
 304     if (size < offset)
 305         return FALSE;
 306
 307     if ((sd->owner_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 308         (offset + sd->owner_len > size))
 309         return FALSE;
 310     owner = sd_get_owner( sd );
 311     if (owner)
 312     {
 313         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
 314         if ((sd->owner_len < sizeof(SID)) || (needed_size > sd->owner_len))
 315             return FALSE;
 316     }
 317     offset += sd->owner_len;
 318
 319     if ((sd->group_len >= FIELD_OFFSET(SID, SubAuthority[255])) ||
 320         (offset + sd->group_len > size))
 321         return FALSE;
 322     group = sd_get_group( sd );
 323     if (group)
 324     {
 325         size_t needed_size = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 326         if ((sd->group_len < sizeof(SID)) || (needed_size > sd->group_len))
 327             return FALSE;
 328     }
 329     offset += sd->group_len;
 330
 331     if ((sd->sacl_len >= MAX_ACL_LEN) || (offset + sd->sacl_len > size))
 332         return FALSE;
 333     sacl = sd_get_sacl( sd, &dummy );
 334     if (sacl && !acl_is_valid( sacl, sd->sacl_len ))
 335         return FALSE;
 336     offset += sd->sacl_len;
 337
 338     if ((sd->dacl_len >= MAX_ACL_LEN) || (offset + sd->dacl_len > size))
 339         return FALSE;
 340     dacl = sd_get_dacl( sd, &dummy );
 341     if (dacl && !acl_is_valid( dacl, sd->dacl_len ))
 342         return FALSE;
 343     offset += sd->dacl_len;
 344
 345     return TRUE;
 346 }
 347
 348 /* maps from generic rights to specific rights as given by a mapping */
 349 static inline void map_generic_mask(unsigned int *mask, const GENERIC_MAPPING *mapping)
 350 {
 351     if (*mask & GENERIC_READ) *mask |= mapping->GenericRead;
 352     if (*mask & GENERIC_WRITE) *mask |= mapping->GenericWrite;
 353     if (*mask & GENERIC_EXECUTE) *mask |= mapping->GenericExecute;
 354     if (*mask & GENERIC_ALL) *mask |= mapping->GenericAll;
 355     *mask &= 0x0FFFFFFF;
 356 }
 357
 358 static inline int is_equal_luid( const LUID *luid1, const LUID *luid2 )
 359 {
 360     return (luid1->LowPart == luid2->LowPart && luid1->HighPart == luid2->HighPart);
 361 }
 362
 363 static inline void allocate_luid( luid_t *luid )
 364 {
 365     prev_luid_value.low_part++;
 366     *luid = prev_luid_value;
 367 }
 368
 369 DECL_HANDLER( allocate_locally_unique_id )
 370 {
 371     allocate_luid( &reply->luid );
 372 }
 373
 374 static inline void luid_and_attr_from_privilege( LUID_AND_ATTRIBUTES *out, const struct privilege *in)
 375 {
 376     out->Luid = in->luid;
 377     out->Attributes =
 378         (in->enabled ? SE_PRIVILEGE_ENABLED : 0) |
 379         (in->def ? SE_PRIVILEGE_ENABLED_BY_DEFAULT : 0);
 380 }
 381
 382 static struct privilege *privilege_add( struct token *token, const LUID *luid, int enabled )
 383 {
 384     struct privilege *privilege = mem_alloc( sizeof(*privilege) );
 385     if (privilege)
 386     {
 387         privilege->luid = *luid;
 388         privilege->def = privilege->enabled = (enabled != 0);
 389         list_add_tail( &token->privileges, &privilege->entry );
 390     }
 391     return privilege;
 392 }
 393
 394 static inline void privilege_remove( struct privilege *privilege )
 395 {
 396     list_remove( &privilege->entry );
 397     free( privilege );
 398 }
 399
 400 static void token_destroy( struct object *obj )
 401 {
 402     struct token* token;
 403     struct list *cursor, *cursor_next;
 404
 405     assert( obj->ops == &token_ops );
 406     token = (struct token *)obj;
 407
 408     free( token->user );
 409
 410     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->privileges )
 411     {
 412         struct privilege *privilege = LIST_ENTRY( cursor, struct privilege, entry );
 413         privilege_remove( privilege );
 414     }
 415
 416     LIST_FOR_EACH_SAFE( cursor, cursor_next, &token->groups )
 417     {
 418         struct group *group = LIST_ENTRY( cursor, struct group, entry );
 419         list_remove( &group->entry );
 420         free( group );
 421     }
 422
 423     free( token->default_dacl );
 424 }
 425
 426 /* creates a new token.
 427  *  groups may be NULL if group_count is 0.
 428  *  privs may be NULL if priv_count is 0.
 429  *  default_dacl may be NULL, indicating that all objects created by the user
 430  *   are unsecured.
 431  *  modified_id may be NULL, indicating that a new modified_id luid should be
 432  *   allocated.
 433  */
 434 static struct token *create_token( unsigned primary, const SID *user,
 435                                    const SID_AND_ATTRIBUTES *groups, unsigned int group_count,
 436                                    const LUID_AND_ATTRIBUTES *privs, unsigned int priv_count,
 437                                    const ACL *default_dacl, TOKEN_SOURCE source,
 438                                    const luid_t *modified_id,
 439                                    SECURITY_IMPERSONATION_LEVEL impersonation_level )
 440 {
 441     struct token *token = alloc_object( &token_ops );
 442     if (token)
 443     {
 444         unsigned int i;
 445
 446         allocate_luid( &token->token_id );
 447         if (modified_id)
 448             token->modified_id = *modified_id;
 449         else
 450             allocate_luid( &token->modified_id );
 451         list_init( &token->privileges );
 452         list_init( &token->groups );
 453         token->primary = primary;
 454         /* primary tokens don't have impersonation levels */
 455         if (primary)
 456             token->impersonation_level = -1;
 457         else
 458             token->impersonation_level = impersonation_level;
 459         token->default_dacl = NULL;
 460         token->primary_group = NULL;
 461
 462         /* copy user */
 463         token->user = memdup( user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 464         if (!token->user)
 465         {
 466             release_object( token );
 467             return NULL;
 468         }
 469
 470         /* copy groups */
 471         for (i = 0; i < group_count; i++)
 472         {
 473             size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] );
 474             struct group *group = mem_alloc( size );
 475
 476             if (!group)
 477             {
 478                 release_object( token );
 479                 return NULL;
 480             }
 481             memcpy( &group->sid, groups[i].Sid, FIELD_OFFSET( SID, SubAuthority[((const SID *)groups[i].Sid)->SubAuthorityCount] ) );
 482             group->enabled = TRUE;
 483             group->def = TRUE;
 484             group->logon = FALSE;
 485             group->mandatory = (groups[i].Attributes & SE_GROUP_MANDATORY) ? TRUE : FALSE;
 486             group->owner = groups[i].Attributes & SE_GROUP_OWNER ? TRUE : FALSE;
 487             group->resource = FALSE;
 488             group->deny_only = FALSE;
 489             list_add_tail( &token->groups, &group->entry );
 490             /* Use first owner capable group as an owner */
 491             if (!token->primary_group && group->owner)
 492                 token->primary_group = &group->sid;
 493         }
 494
 495         /* copy privileges */
 496         for (i = 0; i < priv_count; i++)
 497         {
 498             /* note: we don't check uniqueness: the caller must make sure
 499              * privs doesn't contain any duplicate luids */
 500             if (!privilege_add( token, &privs[i].Luid,
 501                                 privs[i].Attributes & SE_PRIVILEGE_ENABLED ))
 502             {
 503                 release_object( token );
 504                 return NULL;
 505             }
 506         }
 507
 508         if (default_dacl)
 509         {
 510             token->default_dacl = memdup( default_dacl, default_dacl->AclSize );
 511             if (!token->default_dacl)
 512             {
 513                 release_object( token );
 514                 return NULL;
 515             }
 516         }
 517
 518         token->source = source;
 519     }
 520     return token;
 521 }
 522
 523 static ACL *create_default_dacl( const SID *user )
 524 {
 525     ACCESS_ALLOWED_ACE *aaa;
 526     ACL *default_dacl;
 527     SID *sid;
 528     size_t default_dacl_size = sizeof(ACL) +
 529                                2*(sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 530                                sizeof(local_system_sid) +
 531                                FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 532
 533     default_dacl = mem_alloc( default_dacl_size );
 534     if (!default_dacl) return NULL;
 535
 536     default_dacl->AclRevision = MAX_ACL_REVISION;
 537     default_dacl->Sbz1 = 0;
 538     default_dacl->AclSize = default_dacl_size;
 539     default_dacl->AceCount = 2;
 540     default_dacl->Sbz2 = 0;
 541
 542     /* GENERIC_ALL for Local System */
 543     aaa = (ACCESS_ALLOWED_ACE *)(default_dacl + 1);
 544     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 545     aaa->Header.AceFlags = 0;
 546     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 547                           sizeof(local_system_sid);
 548     aaa->Mask = GENERIC_ALL;
 549     sid = (SID *)&aaa->SidStart;
 550     memcpy( sid, &local_system_sid, sizeof(local_system_sid) );
 551
 552     /* GENERIC_ALL for specified user */
 553     aaa = (ACCESS_ALLOWED_ACE *)((char *)aaa + aaa->Header.AceSize);
 554     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 555     aaa->Header.AceFlags = 0;
 556     aaa->Header.AceSize = (sizeof(ACCESS_ALLOWED_ACE) - sizeof(DWORD)) +
 557                           FIELD_OFFSET( SID, SubAuthority[user->SubAuthorityCount] );
 558     aaa->Mask = GENERIC_ALL;
 559     sid = (SID *)&aaa->SidStart;
 560     memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 561
 562     return default_dacl;
 563 }
 564
 565 struct sid_data
 566 {
 567     SID_IDENTIFIER_AUTHORITY idauth;
 568     int count;
 569     unsigned int subauth[MAX_SUBAUTH_COUNT];
 570 };
 571
 572 struct token *token_create_admin( void )
 573 {
 574     struct token *token = NULL;
 575     static const SID_IDENTIFIER_AUTHORITY nt_authority = { SECURITY_NT_AUTHORITY };
 576     static const unsigned int alias_admins_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS };
 577     static const unsigned int alias_users_subauth[] = { SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_USERS };
 578     /* on Windows, this value changes every time the user logs on */
 579     static const unsigned int logon_subauth[] = { SECURITY_LOGON_IDS_RID, 0, 1 /* FIXME: should be randomly generated when tokens are inherited by new processes */ };
 580     PSID alias_admins_sid;
 581     PSID alias_users_sid;
 582     PSID logon_sid;
 583     /* note: should be the owner specified in the token */
 584     ACL *default_dacl = create_default_dacl( &interactive_sid );
 585
 586     alias_admins_sid = security_sid_alloc( &nt_authority, sizeof(alias_admins_subauth)/sizeof(alias_admins_subauth[0]),
 587                                            alias_admins_subauth );
 588     alias_users_sid = security_sid_alloc( &nt_authority, sizeof(alias_users_subauth)/sizeof(alias_users_subauth[0]),
 589                                           alias_users_subauth );
 590     logon_sid = security_sid_alloc( &nt_authority, sizeof(logon_subauth)/sizeof(logon_subauth[0]),
 591                                     logon_subauth );
 592
 593     if (alias_admins_sid && alias_users_sid && logon_sid && default_dacl)
 594     {
 595         const LUID_AND_ATTRIBUTES admin_privs[] =
 596         {
 597             { SeChangeNotifyPrivilege        , SE_PRIVILEGE_ENABLED },
 598             { SeSecurityPrivilege            , 0                    },
 599             { SeBackupPrivilege              , 0                    },
 600             { SeRestorePrivilege             , 0                    },
 601             { SeSystemtimePrivilege          , 0                    },
 602             { SeShutdownPrivilege            , 0                    },
 603             { SeRemoteShutdownPrivilege      , 0                    },
 604             { SeTakeOwnershipPrivilege       , 0                    },
 605             { SeDebugPrivilege               , 0                    },
 606             { SeSystemEnvironmentPrivilege   , 0                    },
 607             { SeSystemProfilePrivilege       , 0                    },
 608             { SeProfileSingleProcessPrivilege, 0                    },
 609             { SeIncreaseBasePriorityPrivilege, 0                    },
 610             { SeLoadDriverPrivilege          , 0                    },
 611             { SeCreatePagefilePrivilege      , 0                    },
 612             { SeIncreaseQuotaPrivilege       , 0                    },
 613             { SeUndockPrivilege              , 0                    },
 614             { SeManageVolumePrivilege        , 0                    },
 615             { SeImpersonatePrivilege         , SE_PRIVILEGE_ENABLED },
 616             { SeCreateGlobalPrivilege        , SE_PRIVILEGE_ENABLED },
 617         };
 618         /* note: we don't include non-builtin groups here for the user -
 619          * telling us these is the job of a client-side program */
 620         const SID_AND_ATTRIBUTES admin_groups[] =
 621         {
 622             { security_world_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 623             { security_local_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 624             { security_interactive_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 625             { security_authenticated_user_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 626             { alias_admins_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_OWNER },
 627             { alias_users_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY },
 628             { logon_sid, SE_GROUP_ENABLED|SE_GROUP_ENABLED_BY_DEFAULT|SE_GROUP_MANDATORY|SE_GROUP_LOGON_ID },
 629         };
 630         static const TOKEN_SOURCE admin_source = {"SeMgr", {0, 0}};
 631         /* note: we just set the user sid to be the interactive builtin sid -
 632          * we should really translate the UNIX user id to a sid */
 633         token = create_token( TRUE, &interactive_sid,
 634                             admin_groups, sizeof(admin_groups)/sizeof(admin_groups[0]),
 635                             admin_privs, sizeof(admin_privs)/sizeof(admin_privs[0]),
 636                             default_dacl, admin_source, NULL, -1 );
 637         /* we really need a primary group */
 638         assert( token->primary_group );
 639     }
 640
 641     free( logon_sid );
 642     free( alias_admins_sid );
 643     free( alias_users_sid );
 644     free( default_dacl );
 645
 646     return token;
 647 }
 648
 649 static struct privilege *token_find_privilege( struct token *token, const LUID *luid, int enabled_only )
 650 {
 651     struct privilege *privilege;
 652     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 653     {
 654         if (is_equal_luid( luid, &privilege->luid ))
 655         {
 656             if (enabled_only && !privilege->enabled)
 657                 return NULL;
 658             return privilege;
 659         }
 660     }
 661     return NULL;
 662 }
 663
 664 static unsigned int token_adjust_privileges( struct token *token, const LUID_AND_ATTRIBUTES *privs,
 665                                              unsigned int count, LUID_AND_ATTRIBUTES *mod_privs,
 666                                              unsigned int mod_privs_count )
 667 {
 668     unsigned int i, modified_count = 0;
 669
 670     /* mark as modified */
 671     allocate_luid( &token->modified_id );
 672
 673     for (i = 0; i < count; i++)
 674     {
 675         struct privilege *privilege =
 676             token_find_privilege( token, &privs[i].Luid, FALSE );
 677         if (!privilege)
 678         {
 679             set_error( STATUS_NOT_ALL_ASSIGNED );
 680             continue;
 681         }
 682
 683         if (privs[i].Attributes & SE_PRIVILEGE_REMOVE)
 684             privilege_remove( privilege );
 685         else
 686         {
 687             /* save previous state for caller */
 688             if (mod_privs_count)
 689             {
 690                 luid_and_attr_from_privilege(mod_privs, privilege);
 691                 mod_privs++;
 692                 mod_privs_count--;
 693                 modified_count++;
 694             }
 695
 696             if (privs[i].Attributes & SE_PRIVILEGE_ENABLED)
 697                 privilege->enabled = TRUE;
 698             else
 699                 privilege->enabled = FALSE;
 700         }
 701     }
 702     return modified_count;
 703 }
 704
 705 static void token_disable_privileges( struct token *token )
 706 {
 707     struct privilege *privilege;
 708
 709     /* mark as modified */
 710     allocate_luid( &token->modified_id );
 711
 712     LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
 713         privilege->enabled = FALSE;
 714 }
 715
 716 int token_check_privileges( struct token *token, int all_required,
 717                             const LUID_AND_ATTRIBUTES *reqprivs,
 718                             unsigned int count, LUID_AND_ATTRIBUTES *usedprivs)
 719 {
 720     unsigned int i, enabled_count = 0;
 721
 722     for (i = 0; i < count; i++)
 723     {
 724         struct privilege *privilege =
 725             token_find_privilege( token, &reqprivs[i].Luid, TRUE );
 726
 727         if (usedprivs)
 728             usedprivs[i] = reqprivs[i];
 729
 730         if (privilege && privilege->enabled)
 731         {
 732             enabled_count++;
 733             if (usedprivs)
 734                 usedprivs[i].Attributes |= SE_PRIVILEGE_USED_FOR_ACCESS;
 735         }
 736     }
 737
 738     if (all_required)
 739         return (enabled_count == count);
 740     else
 741         return (enabled_count > 0);
 742 }
 743
 744 static int token_sid_present( struct token *token, const SID *sid, int deny )
 745 {
 746     struct group *group;
 747
 748     if (security_equal_sid( token->user, sid )) return TRUE;
 749
 750     LIST_FOR_EACH_ENTRY( group, &token->groups, struct group, entry )
 751     {
 752         if (!group->enabled) continue;
 753         if (group->deny_only && !deny) continue;
 754
 755         if (security_equal_sid( &group->sid, sid )) return TRUE;
 756     }
 757
 758     return FALSE;
 759 }
 760
 761 /* Checks access to a security descriptor. 'sd' must have been validated by
 762  * caller. It returns STATUS_SUCCESS if call succeeded or an error indicating
 763  * the reason. 'status' parameter will indicate if access is granted or denied.
 764  *
 765  * If both returned value and 'status' are STATUS_SUCCESS then access is granted.
 766  */
 767 static unsigned int token_access_check( struct token *token,
 768                                  const struct security_descriptor *sd,
 769                                  unsigned int desired_access,
 770                                  LUID_AND_ATTRIBUTES *privs,
 771                                  unsigned int *priv_count,
 772                                  const GENERIC_MAPPING *mapping,
 773                                  unsigned int *granted_access,
 774                                  unsigned int *status )
 775 {
 776     unsigned int current_access = 0;
 777     unsigned int denied_access = 0;
 778     ULONG i;
 779     const ACL *dacl;
 780     int dacl_present;
 781     const ACE_HEADER *ace;
 782     const SID *owner;
 783
 784     /* assume no access rights */
 785     *granted_access = 0;
 786
 787     /* fail if desired_access contains generic rights */
 788     if (desired_access & (GENERIC_READ|GENERIC_WRITE|GENERIC_EXECUTE|GENERIC_ALL))
 789     {
 790         *priv_count = 0;
 791         return STATUS_GENERIC_NOT_MAPPED;
 792     }
 793
 794     dacl = sd_get_dacl( sd, &dacl_present );
 795     owner = sd_get_owner( sd );
 796     if (!owner || !sd_get_group( sd ))
 797     {
 798         *priv_count = 0;
 799         return STATUS_INVALID_SECURITY_DESCR;
 800     }
 801
 802     /* 1: Grant desired access if the object is unprotected */
 803     if (!dacl_present)
 804     {
 805         *priv_count = 0;
 806         *granted_access = desired_access;
 807         return *status = STATUS_SUCCESS;
 808     }
 809     if (!dacl)
 810     {
 811         *priv_count = 0;
 812         *status = STATUS_ACCESS_DENIED;
 813         return STATUS_SUCCESS;
 814     }
 815
 816     /* 2: Check if caller wants access to system security part. Note: access
 817      * is only granted if specifically asked for */
 818     if (desired_access & ACCESS_SYSTEM_SECURITY)
 819     {
 820         const LUID_AND_ATTRIBUTES security_priv = { SeSecurityPrivilege, 0 };
 821         LUID_AND_ATTRIBUTES retpriv = security_priv;
 822         if (token_check_privileges( token, TRUE, &security_priv, 1, &retpriv ))
 823         {
 824             if (priv_count)
 825             {
 826                 /* assumes that there will only be one privilege to return */
 827                 if (*priv_count >= 1)
 828                 {
 829                     *priv_count = 1;
 830                     *privs = retpriv;
 831                 }
 832                 else
 833                 {
 834                     *priv_count = 1;
 835                     return STATUS_BUFFER_TOO_SMALL;
 836                 }
 837             }
 838             current_access |= ACCESS_SYSTEM_SECURITY;
 839             if (desired_access == current_access)
 840             {
 841                 *granted_access = current_access;
 842                 return *status = STATUS_SUCCESS;
 843             }
 844         }
 845         else
 846         {
 847             *priv_count = 0;
 848             *status = STATUS_PRIVILEGE_NOT_HELD;
 849             return STATUS_SUCCESS;
 850         }
 851     }
 852     else if (priv_count) *priv_count = 0;
 853
 854     /* 3: Check whether the token is the owner */
 855     /* NOTE: SeTakeOwnershipPrivilege is not checked for here - it is instead
 856      * checked when a "set owner" call is made, overriding the access rights
 857      * determined here. */
 858     if (token_sid_present( token, owner, FALSE ))
 859     {
 860         current_access |= (READ_CONTROL | WRITE_DAC);
 861         if (desired_access == current_access)
 862         {
 863             *granted_access = current_access;
 864             return *status = STATUS_SUCCESS;
 865         }
 866     }
 867
 868     /* 4: Grant rights according to the DACL */
 869     ace = (const ACE_HEADER *)(dacl + 1);
 870     for (i = 0; i < dacl->AceCount; i++)
 871     {
 872         const ACCESS_ALLOWED_ACE *aa_ace;
 873         const ACCESS_DENIED_ACE *ad_ace;
 874         const SID *sid;
 875         switch (ace->AceType)
 876         {
 877         case ACCESS_DENIED_ACE_TYPE:
 878             ad_ace = (const ACCESS_DENIED_ACE *)ace;
 879             sid = (const SID *)&ad_ace->SidStart;
 880             if (token_sid_present( token, sid, TRUE ))
 881             {
 882                 unsigned int access = ad_ace->Mask;
 883                 map_generic_mask(&access, mapping);
 884                 if (desired_access & MAXIMUM_ALLOWED)
 885                     denied_access |= access;
 886                 else
 887                 {
 888                     denied_access |= (access & ~current_access);
 889                     if (desired_access & access) goto done;
 890                 }
 891             }
 892             break;
 893         case ACCESS_ALLOWED_ACE_TYPE:
 894             aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 895             sid = (const SID *)&aa_ace->SidStart;
 896             if (token_sid_present( token, sid, FALSE ))
 897             {
 898                 unsigned int access = aa_ace->Mask;
 899                 map_generic_mask(&access, mapping);
 900                 if (desired_access & MAXIMUM_ALLOWED)
 901                     current_access |= access;
 902                 else
 903                     current_access |= (access & ~denied_access);
 904             }
 905             break;
 906         }
 907
 908         /* don't bother carrying on checking if we've already got all of
 909             * rights we need */
 910         if (desired_access == *granted_access)
 911             break;
 912
 913         ace = ace_next( ace );
 914     }
 915
 916 done:
 917     if (desired_access & MAXIMUM_ALLOWED)
 918         *granted_access = current_access & ~denied_access;
 919     else
 920         if ((current_access & desired_access) == desired_access)
 921             *granted_access = current_access & desired_access;
 922         else
 923             *granted_access = 0;
 924
 925     *status = *granted_access ? STATUS_SUCCESS : STATUS_ACCESS_DENIED;
 926     return STATUS_SUCCESS;
 927 }
 928
 929 const ACL *token_get_default_dacl( struct token *token )
 930 {
 931     return token->default_dacl;
 932 }
 933
 934 static void set_object_sd( struct object *obj, const struct security_descriptor *sd,
 935                            unsigned int set_info )
 936 {
 937     struct security_descriptor new_sd, *pnew_sd;
 938     int present;
 939     const SID *owner, *group;
 940     const ACL *sacl, *dacl;
 941     char *ptr;
 942
 943     if (!set_info) return;
 944
 945     new_sd.control = sd->control & ~SE_SELF_RELATIVE;
 946
 947     owner = sd_get_owner( sd );
 948     if (set_info & OWNER_SECURITY_INFORMATION && owner)
 949         new_sd.owner_len = sd->owner_len;
 950     else
 951     {
 952         owner = current->process->token->user;
 953         new_sd.owner_len = FIELD_OFFSET(SID, SubAuthority[owner->SubAuthorityCount]);
 954         new_sd.control |= SE_OWNER_DEFAULTED;
 955     }
 956
 957     group = sd_get_group( sd );
 958     if (set_info & GROUP_SECURITY_INFORMATION && group)
 959         new_sd.group_len = sd->group_len;
 960     else
 961     {
 962         group = current->process->token->primary_group;
 963         new_sd.group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 964         new_sd.control |= SE_GROUP_DEFAULTED;
 965     }
 966
 967     new_sd.control |= SE_SACL_PRESENT;
 968     sacl = sd_get_sacl( sd, &present );
 969     if (set_info & SACL_SECURITY_INFORMATION && present)
 970         new_sd.sacl_len = sd->sacl_len;
 971     else
 972     {
 973         if (obj->sd) sacl = sd_get_sacl( obj->sd, &present );
 974
 975         if (obj->sd && present)
 976             new_sd.sacl_len = obj->sd->sacl_len;
 977         else
 978         {
 979             new_sd.sacl_len = 0;
 980             new_sd.control |= SE_SACL_DEFAULTED;
 981         }
 982     }
 983
 984     new_sd.control |= SE_DACL_PRESENT;
 985     dacl = sd_get_dacl( sd, &present );
 986     if (set_info & DACL_SECURITY_INFORMATION && present)
 987         new_sd.dacl_len = sd->dacl_len;
 988     else
 989     {
 990         if (obj->sd) dacl = sd_get_dacl( obj->sd, &present );
 991
 992         if (obj->sd && present)
 993             new_sd.dacl_len = obj->sd->dacl_len;
 994         else
 995         {
 996             dacl = token_get_default_dacl( current->process->token );
 997             new_sd.dacl_len = dacl->AclSize;
 998             new_sd.control |= SE_DACL_DEFAULTED;
 999         }
1000     }
1001
1002     ptr = mem_alloc( sizeof(new_sd) + new_sd.owner_len + new_sd.group_len +
1003                      new_sd.sacl_len + new_sd.dacl_len );
1004     if (!ptr) return;
1005     pnew_sd = (struct security_descriptor*)ptr;
1006
1007     memcpy( ptr, &new_sd, sizeof(new_sd) );
1008     ptr += sizeof(new_sd);
1009     memcpy( ptr, owner, new_sd.owner_len );
1010     ptr += new_sd.owner_len;
1011     memcpy( ptr, group, new_sd.group_len );
1012     ptr += new_sd.group_len;
1013     memcpy( ptr, sacl, new_sd.sacl_len );
1014     ptr += new_sd.sacl_len;
1015     memcpy( ptr, dacl, new_sd.dacl_len );
1016
1017     free( obj->sd );
1018     obj->sd = pnew_sd;
1019 }
1020
1021 int check_object_access(struct object *obj, unsigned int *access)
1022 {
1023     GENERIC_MAPPING mapping;
1024     struct token *token = current->token ? current->token : current->process->token;
1025     LUID_AND_ATTRIBUTES priv;
1026     unsigned int status, priv_count = 1;
1027     int res;
1028
1029     mapping.GenericAll = obj->ops->map_access( obj, GENERIC_ALL );
1030
1031     if (!obj->sd)
1032     {
1033         if (*access & MAXIMUM_ALLOWED)
1034             *access = mapping.GenericAll;
1035         return TRUE;
1036     }
1037
1038     mapping.GenericRead  = obj->ops->map_access( obj, GENERIC_READ );
1039     mapping.GenericWrite = obj->ops->map_access( obj, GENERIC_WRITE );
1040     mapping.GenericExecute = obj->ops->map_access( obj, GENERIC_EXECUTE );
1041
1042     res = token_access_check( token, obj->sd, *access, &priv, &priv_count,
1043                               &mapping, access, &status ) == STATUS_SUCCESS &&
1044           status == STATUS_SUCCESS;
1045
1046     if (!res) set_error( STATUS_ACCESS_DENIED );
1047     return res;
1048 }
1049
1050
1051 /* open a security token */
1052 DECL_HANDLER(open_token)
1053 {
1054     if (req->flags & OPEN_TOKEN_THREAD)
1055     {
1056         struct thread *thread = get_thread_from_handle( req->handle, 0 );
1057         if (thread)
1058         {
1059             if (thread->token)
1060             {
1061                 if (thread->token->impersonation_level <= SecurityAnonymous)
1062                     set_error( STATUS_CANT_OPEN_ANONYMOUS );
1063                 else
1064                     reply->token = alloc_handle( current->process, thread->token,
1065                                                  req->access, req->attributes );
1066             }
1067             else
1068                 set_error( STATUS_NO_TOKEN );
1069             release_object( thread );
1070         }
1071     }
1072     else
1073     {
1074         struct process *process = get_process_from_handle( req->handle, 0 );
1075         if (process)
1076         {
1077             if (process->token)
1078                 reply->token = alloc_handle( current->process, process->token, req->access,
1079                                              req->attributes );
1080             else
1081                 set_error( STATUS_NO_TOKEN );
1082             release_object( process );
1083         }
1084     }
1085 }
1086
1087 /* adjust the privileges held by a token */
1088 DECL_HANDLER(adjust_token_privileges)
1089 {
1090     struct token *token;
1091     unsigned int access = TOKEN_ADJUST_PRIVILEGES;
1092
1093     if (req->get_modified_state) access |= TOKEN_QUERY;
1094
1095     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1096                                                  access, &token_ops )))
1097     {
1098         const LUID_AND_ATTRIBUTES *privs = get_req_data();
1099         LUID_AND_ATTRIBUTES *modified_privs = NULL;
1100         unsigned int priv_count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1101         unsigned int modified_priv_count = 0;
1102
1103         if (req->get_modified_state && !req->disable_all)
1104         {
1105             unsigned int i;
1106             /* count modified privs */
1107             for (i = 0; i < priv_count; i++)
1108             {
1109                 struct privilege *privilege =
1110                     token_find_privilege( token, &privs[i].Luid, FALSE );
1111                 if (privilege && req->get_modified_state)
1112                     modified_priv_count++;
1113             }
1114             reply->len = modified_priv_count;
1115             modified_priv_count = min( modified_priv_count, get_reply_max_size() / sizeof(*modified_privs) );
1116             if (modified_priv_count)
1117                 modified_privs = set_reply_data_size( modified_priv_count * sizeof(*modified_privs) );
1118         }
1119         reply->len = modified_priv_count * sizeof(*modified_privs);
1120
1121         if (req->disable_all)
1122             token_disable_privileges( token );
1123         else
1124             modified_priv_count = token_adjust_privileges( token, privs,
1125                 priv_count, modified_privs, modified_priv_count );
1126
1127         release_object( token );
1128     }
1129 }
1130
1131 /* retrieves the list of privileges that may be held be the token */
1132 DECL_HANDLER(get_token_privileges)
1133 {
1134     struct token *token;
1135
1136     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1137                                                  TOKEN_QUERY,
1138                                                  &token_ops )))
1139     {
1140         int priv_count = 0;
1141         LUID_AND_ATTRIBUTES *privs;
1142         struct privilege *privilege;
1143
1144         LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
1145             priv_count++;
1146
1147         reply->len = priv_count * sizeof(*privs);
1148         if (reply->len <= get_reply_max_size())
1149         {
1150             privs = set_reply_data_size( priv_count * sizeof(*privs) );
1151             if (privs)
1152             {
1153                 int i = 0;
1154                 LIST_FOR_EACH_ENTRY( privilege, &token->privileges, struct privilege, entry )
1155                 {
1156                     luid_and_attr_from_privilege( &privs[i], privilege );
1157                     i++;
1158                 }
1159             }
1160         }
1161         else
1162             set_error(STATUS_BUFFER_TOO_SMALL);
1163
1164         release_object( token );
1165     }
1166 }
1167
1168 /* creates a duplicate of the token */
1169 DECL_HANDLER(duplicate_token)
1170 {
1171     struct token *src_token;
1172
1173     if ((req->impersonation_level < SecurityAnonymous) ||
1174         (req->impersonation_level > SecurityDelegation))
1175     {
1176         set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1177         return;
1178     }
1179
1180     if ((src_token = (struct token *)get_handle_obj( current->process, req->handle,
1181                                                      TOKEN_DUPLICATE,
1182                                                      &token_ops )))
1183     {
1184         const luid_t *modified_id =
1185             req->primary || (req->impersonation_level == src_token->impersonation_level) ?
1186                 &src_token->modified_id : NULL;
1187         struct token *token = NULL;
1188
1189         if (req->primary || (req->impersonation_level <= src_token->impersonation_level))
1190             token = create_token( req->primary, src_token->user, NULL, 0,
1191                                   NULL, 0, src_token->default_dacl,
1192                                   src_token->source, modified_id,
1193                                   req->impersonation_level );
1194         else set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1195
1196         if (token)
1197         {
1198             struct privilege *privilege;
1199             struct group *group;
1200             unsigned int access;
1201
1202             /* copy groups */
1203             LIST_FOR_EACH_ENTRY( group, &src_token->groups, struct group, entry )
1204             {
1205                 size_t size = FIELD_OFFSET( struct group, sid.SubAuthority[group->sid.SubAuthorityCount] );
1206                 struct group *newgroup = mem_alloc( size );
1207                 if (!newgroup)
1208                 {
1209                     release_object( token );
1210                     release_object( src_token );
1211                     return;
1212                 }
1213                 memcpy( newgroup, group, size );
1214                 list_add_tail( &token->groups, &newgroup->entry );
1215             }
1216             token->primary_group = src_token->primary_group;
1217             assert( token->primary_group );
1218
1219             /* copy privileges */
1220             LIST_FOR_EACH_ENTRY( privilege, &src_token->privileges, struct privilege, entry )
1221                 privilege_add( token, &privilege->luid, privilege->enabled );
1222
1223             access = req->access;
1224             reply->new_handle = alloc_handle( current->process, token, access, req->attributes);
1225             release_object( token );
1226         }
1227         release_object( src_token );
1228     }
1229 }
1230
1231 /* checks the specified privileges are held by the token */
1232 DECL_HANDLER(check_token_privileges)
1233 {
1234     struct token *token;
1235
1236     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1237                                                  TOKEN_QUERY,
1238                                                  &token_ops )))
1239     {
1240         unsigned int count = get_req_data_size() / sizeof(LUID_AND_ATTRIBUTES);
1241
1242         if (!token->primary && token->impersonation_level <= SecurityAnonymous)
1243             set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1244         else if (get_reply_max_size() >= count * sizeof(LUID_AND_ATTRIBUTES))
1245         {
1246             LUID_AND_ATTRIBUTES *usedprivs = set_reply_data_size( count * sizeof(*usedprivs) );
1247             reply->has_privileges = token_check_privileges( token, req->all_required, get_req_data(), count, usedprivs );
1248         }
1249         else
1250             set_error( STATUS_BUFFER_OVERFLOW );
1251         release_object( token );
1252     }
1253 }
1254
1255 /* checks that a user represented by a token is allowed to access an object
1256  * represented by a security descriptor */
1257 DECL_HANDLER(access_check)
1258 {
1259     data_size_t sd_size = get_req_data_size();
1260     const struct security_descriptor *sd = get_req_data();
1261     struct token *token;
1262
1263     if (!sd_is_valid( sd, sd_size ))
1264     {
1265         set_error( STATUS_ACCESS_VIOLATION );
1266         return;
1267     }
1268
1269     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1270                                                  TOKEN_QUERY,
1271                                                  &token_ops )))
1272     {
1273         GENERIC_MAPPING mapping;
1274         unsigned int status;
1275         LUID_AND_ATTRIBUTES priv;
1276         unsigned int priv_count = 1;
1277
1278         memset(&priv, 0, sizeof(priv));
1279
1280         /* only impersonation tokens may be used with this function */
1281         if (token->primary)
1282         {
1283             set_error( STATUS_NO_IMPERSONATION_TOKEN );
1284             release_object( token );
1285             return;
1286         }
1287         /* anonymous impersonation tokens can't be used */
1288         if (token->impersonation_level <= SecurityAnonymous)
1289         {
1290             set_error( STATUS_BAD_IMPERSONATION_LEVEL );
1291             release_object( token );
1292             return;
1293         }
1294
1295         mapping.GenericRead = req->mapping_read;
1296         mapping.GenericWrite = req->mapping_write;
1297         mapping.GenericExecute = req->mapping_execute;
1298         mapping.GenericAll = req->mapping_all;
1299
1300         status = token_access_check(
1301             token, sd, req->desired_access, &priv, &priv_count, &mapping,
1302             &reply->access_granted, &reply->access_status );
1303
1304         reply->privileges_len = priv_count*sizeof(LUID_AND_ATTRIBUTES);
1305
1306         if ((priv_count > 0) && (reply->privileges_len <= get_reply_max_size()))
1307         {
1308             LUID_AND_ATTRIBUTES *privs = set_reply_data_size( priv_count * sizeof(*privs) );
1309             memcpy( privs, &priv, sizeof(priv) );
1310         }
1311
1312         set_error( status );
1313         release_object( token );
1314     }
1315 }
1316
1317 /* retrieves the SID of the user that the token represents */
1318 DECL_HANDLER(get_token_user)
1319 {
1320     struct token *token;
1321
1322     reply->user_len = 0;
1323
1324     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1325                                                  TOKEN_QUERY,
1326                                                  &token_ops )))
1327     {
1328         const SID *user = token->user;
1329
1330         reply->user_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
1331         if (reply->user_len <= get_reply_max_size())
1332         {
1333             SID *user_reply = set_reply_data_size( reply->user_len );
1334             if (user_reply)
1335                 memcpy( user_reply, user, reply->user_len );
1336         }
1337         else set_error( STATUS_BUFFER_TOO_SMALL );
1338
1339         release_object( token );
1340     }
1341 }
1342
1343 /* retrieves the groups that the user represented by the token belongs to */
1344 DECL_HANDLER(get_token_groups)
1345 {
1346     struct token *token;
1347
1348     reply->user_len = 0;
1349
1350     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1351                                                  TOKEN_QUERY,
1352                                                  &token_ops )))
1353     {
1354         size_t size_needed = sizeof(struct token_groups);
1355         unsigned int group_count = 0;
1356         const struct group *group;
1357
1358         LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
1359         {
1360             group_count++;
1361             size_needed += FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]);
1362         }
1363         size_needed += sizeof(unsigned int) * group_count;
1364
1365         reply->user_len = size_needed;
1366
1367         if (size_needed <= get_reply_max_size())
1368         {
1369             struct token_groups *tg = set_reply_data_size( size_needed );
1370             if (tg)
1371             {
1372                 unsigned int *attr_ptr = (unsigned int *)(tg + 1);
1373                 SID *sid_ptr = (SID *)(attr_ptr + group_count);
1374
1375                 tg->count = group_count;
1376
1377                 LIST_FOR_EACH_ENTRY( group, &token->groups, const struct group, entry )
1378                 {
1379
1380                     *attr_ptr = 0;
1381                     if (group->mandatory) *attr_ptr |= SE_GROUP_MANDATORY;
1382                     if (group->def) *attr_ptr |= SE_GROUP_ENABLED_BY_DEFAULT;
1383                     if (group->enabled) *attr_ptr |= SE_GROUP_ENABLED;
1384                     if (group->owner) *attr_ptr |= SE_GROUP_OWNER;
1385                     if (group->deny_only) *attr_ptr |= SE_GROUP_USE_FOR_DENY_ONLY;
1386                     if (group->resource) *attr_ptr |= SE_GROUP_RESOURCE;
1387
1388                     memcpy(sid_ptr, &group->sid, FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]));
1389
1390                     sid_ptr = (SID *)((char *)sid_ptr + FIELD_OFFSET(SID, SubAuthority[group->sid.SubAuthorityCount]));
1391                     attr_ptr++;
1392                 }
1393             }
1394         }
1395         else set_error( STATUS_BUFFER_TOO_SMALL );
1396
1397         release_object( token );
1398     }
1399 }
1400
1401 DECL_HANDLER(get_token_impersonation_level)
1402 {
1403     struct token *token;
1404
1405     if ((token = (struct token *)get_handle_obj( current->process, req->handle,
1406                                                  TOKEN_QUERY,
1407                                                  &token_ops )))
1408     {
1409         if (token->primary)
1410             set_error( STATUS_INVALID_PARAMETER );
1411         else
1412             reply->impersonation_level = token->impersonation_level;
1413
1414         release_object( token );
1415     }
1416 }
1417
1418 DECL_HANDLER(set_security_object)
1419 {
1420     data_size_t sd_size = get_req_data_size();
1421     const struct security_descriptor *sd = get_req_data();
1422     struct object *obj;
1423     unsigned int access = 0;
1424
1425     if (!sd_is_valid( sd, sd_size ))
1426     {
1427         set_error( STATUS_ACCESS_VIOLATION );
1428         return;
1429     }
1430
1431     if (req->security_info & OWNER_SECURITY_INFORMATION ||
1432         req->security_info & GROUP_SECURITY_INFORMATION)
1433         access |= WRITE_OWNER;
1434     if (req->security_info & SACL_SECURITY_INFORMATION)
1435         access |= ACCESS_SYSTEM_SECURITY;
1436     if (req->security_info & DACL_SECURITY_INFORMATION)
1437         access |= WRITE_DAC;
1438
1439     if (!(obj = get_handle_obj( current->process, req->handle, access, NULL ))) return;
1440
1441     set_object_sd( obj, sd, req->security_info );
1442     release_object( obj );
1443 }